Papers, Addresses, Reports: Conservation Research Program of the Illinois Natural History Survey (Presidential Address); The Betatron; Excerpts from Lecture, "A Naturalist in the South Seas"; Extract from the Report of the Section Chairman...

Papers, Addresses, Reports: Applied Science as it Affects our Engineering; Looking Through Great Telescopes; John Wolf, Illinois Naturalist; Extract from the Report of the Section Chairman (Agriculture); Influence of age on the value of seed...